Lightning Round: Aetna, Greenbrier & More By: CNBC.com News May 20, 2014 at 18:49 PM EDT Are you ready skeedaddy???!!! It's time for the Lightning Round. Cramer makes the call on viewer favorites. Read More >> Related Stocks: Aetna Calamp Corp Canadian Solar Inc Greenbrier Companies Gw Pharma ADR Pioneer Natural Resources Spectra Energy Whole Foods Market